Bridge of promise for Ackerman stores

I have problem with clothing store we had agreement of R250.00 debit order for passed six month up until last month they change our agreement and debit R1333.00 on my account I called they head office and they said I must wait for them to call me they still investigate that mistake up until now I’m still waiting for them to call me. and this morning they did same thing debit R776 on my account what must I do .